An improved synthesis of [<sup>11</sup>C]MENET via Suzuki coupling with [<sup>11</sup>C]methyl iodide
作者:Fanxing Zeng、Ronald J. Voll、Ronald J. Crowe、Michael S. Waldrep、Karen B. Dolph、Mark M. Goodman
DOI:10.1002/jlcr.3047
日期:2013.5.15
[11C]MENET, a promising norepinephrine transporter imaging agent, was prepared by Suzuki cross coupling of 1 mg N-t-Boc pinacolborate precursor with [11C]CH3I in DMF using palladium complex generated in situ from Pd2(dba)3 and (o-CH3C6H4)3P together with K2CO3 as the co-catalyst, followed by deprotection with trifluoroacetic acid. This improved radiolabeling method provided [11C]MENET in high radiochemical yield at end of synthesis (EOS, 51 ± 3%, decay-corrected from end of 11CH3I synthesis, n = 6), moderate specific activity (1.5–1.9 Ci/µmol at EOS), and high radiochemical (>98%) and chemical purity (>98%) in a synthesis time of 60 ± 5 min from the end of bombardment. Copyright © 2013 John Wiley & Sons, Ltd.
以 Pd2(dba)3 和 (o-CH3C6H4)3P 为原位生成的钯复合物以及 K2CO3 为助催化剂,在 DMF 中将 1 毫克 N-t-Boc 频哪醇硼酸酯前体与 [11C]CH3I 进行铃木交叉偶联,然后用三氟乙酸进行脱保护,制备出了[11C]MENET--一种很有前景的去甲肾上腺素转运体成像剂。这种改进的放射性标记方法提供的[11C]MENET在合成结束时具有较高的放射化学收率(EOS,51 ± 3%,从 11CH3I 合成结束时的衰变校正,n = 6)、中等的比活度(EOS 时为 1.5-1.9 Ci/µmol)以及较高的放射化学纯度(>98%)和化学纯度(>98%),合成时间为轰击结束后 60 ± 5 分钟。Copyright © 2013 John Wiley & Sons, Ltd. All Rights Reserved.